Call _RegisterApplication on Catalyst while holding a XPC sandbox extension.
<rdar://problem/119217913>
Pull request: https://github.com/WebKit/WebKit/pull/21743
Committed 271998@main (ab569688e977): <https://commits.webkit.org/271998@main> Reviewed commits have been landed. Closing PR #21743 and removing active labels.
Committed 272002@main (236cc5b3746d): <https://commits.webkit.org/272002@main> Reviewed commits have been landed. Closing PR #21757 and removing active labels.
Re-opening for pull request https://github.com/WebKit/WebKit/pull/21764
Committed 272023@main (735eaa9151f8): <https://commits.webkit.org/272023@main> Reviewed commits have been landed. Closing PR #21764 and removing active labels.